Streptolysin O is hemolytically active only in a reversibly reduced state, unlike streptolysin S, which is stable in the presence of oxygen.
2.
Types include streptolysin O ( SLO ), which is oxygen-labile, and streptolysin S ( SLS ), which is oxygen-stable.
3.
Several toxins and secreted enzymes have been identified in " Streptococcus dysgalactiae ", including the haemolysins Streptolysin O ( SLO ) and Streptolysin S ( SLS ), and a correlation between the expression of SLO and SLS and disease severity has been inferred . " speGdys ", a homolog of the " S . pyogenes " superantigen " speG ", has been documented in some " S . dysgalactiae " strains.
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